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<br />1977 - Present Condition <br /> <br />The present condition is simulated using 1977 as a point of reference. <br />Monthly flows and an annual total are summarized in table 11. The <br />quantities shown are representative of conditions that could be expected <br />to occur in a present condition situation if a period of climate similar <br />to the 1941-1977 period was repeated. <br /> <br />As can be expected, the patterns of monthly flows are very simil ar to <br />the patterns portrayed in the historic conditions. An analysis reveals <br />that the major differences between historic records and the present <br />condition simulation occur in the early years of the period before Lake <br />McConaughy was filled. <br /> <br />Irrigation and power generation are the principal uses of water from the <br />PI atte, North Pl atte, and Lower South PI atte Rivers. Any changes in <br />water use under a future condition will have an impact on flows in the <br />system and associated impacts on the many uses of the water. <br /> <br />1977 - Present Condition with Grayrocks Reservoir <br /> <br />The purpose of this alternative, table 12, is to show the impact on <br />flows in the Laramie, North Platte, and Platte Rivers resulting from <br />Grayrocks Dam and Reservoir, a component of the Missouri Basin Power <br />Project on the Laramie River in Wyoming. The reservoir will store <br />more than 145,000 acre-feet, including about 43,000 acre-feet of <br />surcharge, to provide cooling water for power generation and water <br />supply for irrigation. <br /> <br />Th is proj ect will affect flows of <br />confl uence with the Larami e River. <br />operational and, therefore, it has <br />present conditions. <br /> <br />the North Pl atte River below its <br />The project is currently not fully <br />been viewed as a modification to <br /> <br />A component part of this operation is the Corn Creek Irrigation Project. <br />A contractual agreement between Basin Electric and the Corn Creek <br />Irri gati on Di stri ct has been made and eventually a 22,500 acre-foot <br />water supply will be partially provided from the Laramie River with the <br />remainder possibly being suppl ied from Glendo Reservoir to the irriga- <br />tion district. If the irrigation district does not have construction <br />started in 1985, its rights to this water will be lost. <br /> <br />49 <br />